Temporarily disable media layout tests until we can sort something out with the try bots.
Temporarily disable media layout tests until we can sort something out with the try bots.

BUG=16779
TEST=clobber builds of test_shell should not have unexpected failures

Review URL: http://codereview.chromium.org/155551

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@20716 0039d316-1c4b-4281-b951-d872f2087c98

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